5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Maíra Canal mcanal@igalia.com
[ Upstream commit c98b10496b2f3c4f576af3482c71aadcfcbf765e ]
On the Raspberry Pi 5, performance counters are not being cleared when `v3d_perfmon_start()` is called, even though we write to the CLR register. As a result, their values accumulate until they overflow.
The expected behavior is for performance counters to reset to zero at the start of a job. When the job finishes and the perfmon is stopped, the counters should accurately reflect the values for that specific job.
To ensure this behavior, the performance counters are now enabled before being cleared. This allows the CLR register to function as intended, zeroing the counter values when the job begins.
Fixes: 26a4dc29b74a ("drm/v3d: Expose performance counters to userspace") Signed-off-by: Maíra Canal mcanal@igalia.com Reviewed-by: Iago Toral Quiroga itoral@igalia.com Link: https://patchwork.freedesktop.org/patch/msgid/20241204122831.17015-1-mcanal@... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/v3d/v3d_perfmon.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/v3d/v3d_perfmon.c b/drivers/gpu/drm/v3d/v3d_perfmon.c index b74b537e620fc..3de4cc692f44d 100644 --- a/drivers/gpu/drm/v3d/v3d_perfmon.c +++ b/drivers/gpu/drm/v3d/v3d_perfmon.c @@ -49,9 +49,9 @@ void v3d_perfmon_start(struct v3d_dev *v3d, struct v3d_perfmon *perfmon) V3D_CORE_WRITE(0, V3D_V4_PCTR_0_SRC_X(source), channel); }
+ V3D_CORE_WRITE(0, V3D_V4_PCTR_0_EN, mask); V3D_CORE_WRITE(0, V3D_V4_PCTR_0_CLR, mask); V3D_CORE_WRITE(0, V3D_PCTR_0_OVERFLOW, mask); - V3D_CORE_WRITE(0, V3D_V4_PCTR_0_EN, mask);
v3d->active_perfmon = perfmon; }